Create your very own 'Image Planet' using the Polar Coordinates Filter.

Some experimentation is required to find images that work. However the technique is rewarding. This is what you do:
For circular-looking 'planet' the image needs to be square. There's also a considerable advantage in using a panoramic format, long narrow image as the starting point. Either choose a panoramic picture, or crop a regular landscape format shot to a panoramic style.

This is what you do.....

Choose your image and note the bit depth. Look at the image tab (just below the options bar) for 8 or 16(bit)

Open your image

Check the dimensions of the image by Image > Image Size (Ctr+Alt+I).

Make a note of height of your image
Also, make a note of the Resolution.

Create a New Document by File > New (Ctrl+N) and set the height and width to the shortest side of your image you've just noted.

Choose a white background and set the bit depth to match the original

Resolution: Set either to your original or the required amount (avoid going higher to avoid resampling). However, if you're making a print, don't fall below 200ppi.